SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd65c9425ee8e5cfe7a391d4d9135017f294a2867665c02336cd2ab7f18678149' 
  AND token = '3aVKlymS7sRiLqZge3D1Y5a/m7IwLWpYLUtRKoqe+mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}